Thanks for your answer and yes it makes sence. However my products shift in brands, every brand has families and every family has product codes. As the product code being the keyword - many visitors are looking for the product using the product code as a keyword - the SE doesn't have any problems to show the right page. If a visitor use the family name or the brand name in a search, my site has specific landing pages for those searches.
I launched my question because I am worried that my site will go down in the organic ranking because Google could consider all those product pages as duplicated content. I never worried before because I'm in the top 3 for years now. I only started to worry the moment I started to use SEOmoz and they give me thousands of errors for duplicated content.
Mainly, how much must a page differ in content to be considered unique and not risking a penalty from Google for duplicated content. Or otherwise, how much must a page differ for SEOmoz not considering it anymore duplicated content.
